On Wednesday 14 October 2020 17:20:46 Chris Albertson wrote: > A good place to look for DC motor drivers is Polulu. Here is what > they have. I bet you can use one from the "mid-power" section. > https://www.pololu.com/category/11/brushed-dc-motor-drivers > > All of these take PWM and a few pins for forward, reverse brake. > These modern drivers are so good there can pass 20 amps with no heat > sinks. MOSFETs have come a long way. These drivers are really > nothing more than an H-bridge but with a more sophisticated design > that makes them very power efficient > > The lets say you pick the driver linked below. What makes Polulu so > nice to work with is (1) they are based in the US and (2) they provide > a lot of documentations and links to more. I'm betting the driver > below could work for you. $10 is not a bad price. > https://www.pololu.com/product/2999 > > The way I use these is with a microcontroller, typically STM32. The > software reads the encoder signal and drivers the PWM using a PID > loop. A program on a large linux computer sends the value for the PID > loop's set point. Very much like what happens with LCNC. To use > one of these with LCNC, you run the PID loop in HAL with PWM output > going to the driver board One thing, watch the voltage on the > control pins 3.3 or 5 volts. Some are "both" and easier to use. > It looks a bit complex to run with linuxcnc, but also looks like it could work in single mode to run this motor. Not to mention its on-shore so shipping should be quicker. And I'm damned sick of being told 14 days that turns into 14 weeks. Thats about how long its taken to get this motor from Chino kalipornia to Weston WV. The motor however, looks like quality stuff, and runs very quietly. > On Wed, Oct 14, 2020 at 1:42 PM Gene Heskett <[email protected]> wrote: > > After it finally was delivered, testing looks good but now I need a > > controller, smaller and lower voltage than one of Jons pwm-servo's. > > > > This motor supposedly turns 220 rpms no load with 24 volts applied. > > > > It has an encoder on the rear which is making a 5.4khz quadrature > > signal when its running free, out of 4 wires, no index which is fine > > as I'll put a switch on the BS-1 for a home/index anyway. > > > > This motor draws 4 amps at max rated 100 watt input. > > No clue what the LRA amps is but it does jump pretty good getting > > started so I'd expect startup in-rush to be at least 10 amps. > > > > I'd like to control its position like a common rotary servo axis, so > > what do we have in our linuxcnc toolbox that looks like a bi-dir pwn > > controlled twin H bridge to run a 24volt brushed PMDC motor with a > > 10 amp in-rush as if it were a servo? > > > > Thanks all. > > > > Cheers, Gene Heskett > > -- > > "There are four boxes to be used in defense of liberty: > > soap, ballot, jury, and ammo. Please use in that order." > > -Ed Howdershelt (Author) > > If we desire respect for the law, we must first make the law > > respectable. - Louis D. Brandeis > > Genes Web page <http://geneslinuxbox.net:6309/gene> > > > > > > _______________________________________________ > > Emc-users mailing list > > [email protected] > > https://lists.sourceforge.net/lists/listinfo/emc-users
Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
